No load test of transformer adopts power analyzer
transformer No load detection
As an important performance parameter of transformer, the loss of transformer directly affects the efficiency of transformer in the process of operation. On the other hand, it also shows whether the performance of transformer in the process of design and manufacturing meets the requirements.
transformer The no-load test is to apply the rated voltage from any group of coils of the transformer. When other coils are open circuit, measure the no-load loss and no-load current of the transformer to verify whether the process and design of the transformer core can meet the standard requirements; It can also be used to check whether the transformer core has defects, such as local overheating, local poor insulation, etc.
No load loss mainly refers to hysteresis loss and eddy current loss caused by iron core magnetization, as well as no-load additional loss and resistance loss when no-load current passes through the coil. Generally, the resistance loss caused by no-load test can be ignored, because even if there is a relatively large no-load current, the resistance loss caused by no-load test is less than 2% of the total loss, and the percentage of additional loss is very small. Therefore, it can be considered that the no-load loss is consumed on the iron core. The magnitude of no-load loss and no-load current depends on the transformer core structure, the quality of silicon steel sheet and the core manufacturing process.
The purpose of load test is to calculate and determine transformer Whether it is possible to operate in parallel with other transformers; Calculate and detect the thermal stability and dynamic stability of transformer during short circuit; Calculate transformer efficiency; Calculate the change of transformer secondary side voltage due to load change.
Compared with the three-phase transformer with large rated voltage and current, the no-load test can be carried out by the two watt meter method shown in the figure below. When the rated voltage and current of the transformer are large, it must be measured indirectly through voltage transformer and current transformer.
Zimmer's lmg600 series high-precision power analyzer can realize high-precision measurement under very small power factor, and can observe the required parameters through customer customization. Comply with iec60076 transformer parameter detection standard.
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